package com.irdstudio.bsp.executor.core.util.crypt;

/** 
 * DES 加密算法实现类
 * 
 * 通过 byte[] encrypt( String key, byte[] src )方法加密一个字串
 * 通过 byte[] decrypt( String key, byte[] src )方法解密
 *   
 */  



public  class Des
 {

static final int skb0[]={
// for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 
0x00000000,0x00000010,0x20000000,0x20000010,
0x00010000,0x00010010,0x20010000,0x20010010,
0x00000800,0x00000810,0x20000800,0x20000810,
0x00010800,0x00010810,0x20010800,0x20010810,
0x00000020,0x00000030,0x20000020,0x20000030,
0x00010020,0x00010030,0x20010020,0x20010030,
0x00000820,0x00000830,0x20000820,0x20000830,
0x00010820,0x00010830,0x20010820,0x20010830,
0x00080000,0x00080010,0x20080000,0x20080010,
0x00090000,0x00090010,0x20090000,0x20090010,
0x00080800,0x00080810,0x20080800,0x20080810,
0x00090800,0x00090810,0x20090800,0x20090810,
0x00080020,0x00080030,0x20080020,0x20080030,
0x00090020,0x00090030,0x20090020,0x20090030,
0x00080820,0x00080830,0x20080820,0x20080830,
0x00090820,0x00090830,0x20090820,0x20090830,
};

static final int skb1[]={
// for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 
0x00000000,0x02000000,0x00002000,0x02002000,
0x00200000,0x02200000,0x00202000,0x02202000,
0x00000004,0x02000004,0x00002004,0x02002004,
0x00200004,0x02200004,0x00202004,0x02202004,
0x00000400,0x02000400,0x00002400,0x02002400,
0x00200400,0x02200400,0x00202400,0x02202400,
0x00000404,0x02000404,0x00002404,0x02002404,
0x00200404,0x02200404,0x00202404,0x02202404,
0x10000000,0x12000000,0x10002000,0x12002000,
0x10200000,0x12200000,0x10202000,0x12202000,
0x10000004,0x12000004,0x10002004,0x12002004,
0x10200004,0x12200004,0x10202004,0x12202004,
0x10000400,0x12000400,0x10002400,0x12002400,
0x10200400,0x12200400,0x10202400,0x12202400,
0x10000404,0x12000404,0x10002404,0x12002404,
0x10200404,0x12200404,0x10202404,0x12202404,
};

static final int skb2[]={
// for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 
0x00000000,0x00000001,0x00040000,0x00040001,
0x01000000,0x01000001,0x01040000,0x01040001,
0x00000002,0x00000003,0x00040002,0x00040003,
0x01000002,0x01000003,0x01040002,0x01040003,
0x00000200,0x00000201,0x00040200,0x00040201,
0x01000200,0x01000201,0x01040200,0x01040201,
0x00000202,0x00000203,0x00040202,0x00040203,
0x01000202,0x01000203,0x01040202,0x01040203,
0x08000000,0x08000001,0x08040000,0x08040001,
0x09000000,0x09000001,0x09040000,0x09040001,
0x08000002,0x08000003,0x08040002,0x08040003,
0x09000002,0x09000003,0x09040002,0x09040003,
0x08000200,0x08000201,0x08040200,0x08040201,
0x09000200,0x09000201,0x09040200,0x09040201,
0x08000202,0x08000203,0x08040202,0x08040203,
0x09000202,0x09000203,0x09040202,0x09040203,
};

static final int skb3[]={
// for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 
0x00000000,0x00100000,0x00000100,0x00100100,
0x00000008,0x00100008,0x00000108,0x00100108,
0x00001000,0x00101000,0x00001100,0x00101100,
0x00001008,0x00101008,0x00001108,0x00101108,
0x04000000,0x04100000,0x04000100,0x04100100,
0x04000008,0x04100008,0x04000108,0x04100108,
0x04001000,0x04101000,0x04001100,0x04101100,
0x04001008,0x04101008,0x04001108,0x04101108,
0x00020000,0x00120000,0x00020100,0x00120100,
0x00020008,0x00120008,0x00020108,0x00120108,
0x00021000,0x00121000,0x00021100,0x00121100,
0x00021008,0x00121008,0x00021108,0x00121108,
0x04020000,0x04120000,0x04020100,0x04120100,
0x04020008,0x04120008,0x04020108,0x04120108,
0x04021000,0x04121000,0x04021100,0x04121100,
0x04021008,0x04121008,0x04021108,0x04121108,
};

static final int skb4[]={
// for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 
0x00000000,0x10000000,0x00010000,0x10010000,
0x00000004,0x10000004,0x00010004,0x10010004,
0x20000000,0x30000000,0x20010000,0x30010000,
0x20000004,0x30000004,0x20010004,0x30010004,
0x00100000,0x10100000,0x00110000,0x10110000,
0x00100004,0x10100004,0x00110004,0x10110004,
0x20100000,0x30100000,0x20110000,0x30110000,
0x20100004,0x30100004,0x20110004,0x30110004,
0x00001000,0x10001000,0x00011000,0x10011000,
0x00001004,0x10001004,0x00011004,0x10011004,
0x20001000,0x30001000,0x20011000,0x30011000,
0x20001004,0x30001004,0x20011004,0x30011004,
0x00101000,0x10101000,0x00111000,0x10111000,
0x00101004,0x10101004,0x00111004,0x10111004,
0x20101000,0x30101000,0x20111000,0x30111000,
0x20101004,0x30101004,0x20111004,0x30111004,
};
 
static final int skb5[]={
// for D bits (numbered as per FIPS 46) 8 9 11 12 13 14 
0x00000000,0x08000000,0x00000008,0x08000008,
0x00000400,0x08000400,0x00000408,0x08000408,
0x00020000,0x08020000,0x00020008,0x08020008,
0x00020400,0x08020400,0x00020408,0x08020408,
0x00000001,0x08000001,0x00000009,0x08000009,
0x00000401,0x08000401,0x00000409,0x08000409,
0x00020001,0x08020001,0x00020009,0x08020009,
0x00020401,0x08020401,0x00020409,0x08020409,
0x02000000,0x0A000000,0x02000008,0x0A000008,
0x02000400,0x0A000400,0x02000408,0x0A000408,
0x02020000,0x0A020000,0x02020008,0x0A020008,
0x02020400,0x0A020400,0x02020408,0x0A020408,
0x02000001,0x0A000001,0x02000009,0x0A000009,
0x02000401,0x0A000401,0x02000409,0x0A000409,
0x02020001,0x0A020001,0x02020009,0x0A020009,
0x02020401,0x0A020401,0x02020409,0x0A020409,
};

static final int skb6[]={
// for D bits (numbered as per FIPS 46) 16 17 18 19 20 21 
0x00000000,0x00000100,0x00080000,0x00080100,
0x01000000,0x01000100,0x01080000,0x01080100,
0x00000010,0x00000110,0x00080010,0x00080110,
0x01000010,0x01000110,0x01080010,0x01080110,
0x00200000,0x00200100,0x00280000,0x00280100,
0x01200000,0x01200100,0x01280000,0x01280100,
0x00200010,0x00200110,0x00280010,0x00280110,
0x01200010,0x01200110,0x01280010,0x01280110,
0x00000200,0x00000300,0x00080200,0x00080300,
0x01000200,0x01000300,0x01080200,0x01080300,
0x00000210,0x00000310,0x00080210,0x00080310,
0x01000210,0x01000310,0x01080210,0x01080310,
0x00200200,0x00200300,0x00280200,0x00280300,
0x01200200,0x01200300,0x01280200,0x01280300,
0x00200210,0x00200310,0x00280210,0x00280310,
0x01200210,0x01200310,0x01280210,0x01280310,
};

static final int skb7[]={
// for D bits (numbered as per FIPS 46) 22 23 24 25 27 28 
0x00000000,0x04000000,0x00040000,0x04040000,
0x00000002,0x04000002,0x00040002,0x04040002,
0x00002000,0x04002000,0x00042000,0x04042000,
0x00002002,0x04002002,0x00042002,0x04042002,
0x00000020,0x04000020,0x00040020,0x04040020,
0x00000022,0x04000022,0x00040022,0x04040022,
0x00002020,0x04002020,0x00042020,0x04042020,
0x00002022,0x04002022,0x00042022,0x04042022,
0x00000800,0x04000800,0x00040800,0x04040800,
0x00000802,0x04000802,0x00040802,0x04040802,
0x00002800,0x04002800,0x00042800,0x04042800,
0x00002802,0x04002802,0x00042802,0x04042802,
0x00000820,0x04000820,0x00040820,0x04040820,
0x00000822,0x04000822,0x00040822,0x04040822,
0x00002820,0x04002820,0x00042820,0x04042820,
0x00002822,0x04002822,0x00042822,0x04042822,
};

// The key round shifts
static final boolean shifts2[]={false,false,true,true,true,true,true,true,false,true,true,true,true,true,true,false};

static final int SP0[]={
0x00410100, 0x00010000, 0x40400000, 0x40410100,
0x00400000, 0x40010100, 0x40010000, 0x40400000,
0x40010100, 0x00410100, 0x00410000, 0x40000100,
0x40400100, 0x00400000, 0x00000000, 0x40010000,
0x00010000, 0x40000000, 0x00400100, 0x00010100,
0x40410100, 0x00410000, 0x40000100, 0x00400100,
0x40000000, 0x00000100, 0x00010100, 0x40410000,
0x00000100, 0x40400100, 0x40410000, 0x00000000,
0x00000000, 0x40410100, 0x00400100, 0x40010000,
0x00410100, 0x00010000, 0x40000100, 0x00400100,
0x40410000, 0x00000100, 0x00010100, 0x40400000,
0x40010100, 0x40000000, 0x40400000, 0x00410000,
0x40410100, 0x00010100, 0x00410000, 0x40400100,
0x00400000, 0x40000100, 0x40010000, 0x00000000,
0x00010000, 0x00400000, 0x40400100, 0x00410100,
0x40000000, 0x40410000, 0x00000100, 0x40010100,
};

static final int SP1[]={
0x08021002, 0x00000000, 0x00021000, 0x08020000,
0x08000002, 0x00001002, 0x08001000, 0x00021000,
0x00001000, 0x08020002, 0x00000002, 0x08001000,
0x00020002, 0x08021000, 0x08020000, 0x00000002,
0x00020000, 0x08001002, 0x08020002, 0x00001000,
0x00021002, 0x08000000, 0x00000000, 0x00020002,
0x08001002, 0x00021002, 0x08021000, 0x08000002,
0x08000000, 0x00020000, 0x00001002, 0x08021002,
0x00020002, 0x08021000, 0x08001000, 0x00021002,
0x08021002, 0x00020002, 0x08000002, 0x00000000,
0x08000000, 0x00001002, 0x00020000, 0x08020002,
0x00001000, 0x08000000, 0x00021002, 0x08001002,
0x08021000, 0x00001000, 0x00000000, 0x08000002,
0x00000002, 0x08021002, 0x00021000, 0x08020000,
0x08020002, 0x00020000, 0x00001002, 0x08001000,
0x08001002, 0x00000002, 0x08020000, 0x00021000,
};

static final int SP2[]={
0x20800000, 0x00808020, 0x00000020, 0x20800020,
0x20008000, 0x00800000, 0x20800020, 0x00008020,
0x00800020, 0x00008000, 0x00808000, 0x20000000,
0x20808020, 0x20000020, 0x20000000, 0x20808000,
0x00000000, 0x20008000, 0x00808020, 0x00000020,
0x20000020, 0x20808020, 0x00008000, 0x20800000,
0x20808000, 0x00800020, 0x20008020, 0x00808000,
0x00008020, 0x00000000, 0x00800000, 0x20008020,
0x00808020, 0x00000020, 0x20000000, 0x00008000,
0x20000020, 0x20008000, 0x00808000, 0x20800020,
0x00000000, 0x00808020, 0x00008020, 0x20808000,
0x20008000, 0x00800000, 0x20808020, 0x20000000,
0x20008020, 0x20800000, 0x00800000, 0x20808020,
0x00008000, 0x00800020, 0x20800020, 0x00008020,
0x00800020, 0x00000000, 0x20808000, 0x20000020,
0x20800000, 0x20008020, 0x00000020, 0x00808000,
};

static final int SP3[]={
0x00080201, 0x02000200, 0x00000001, 0x02080201,
0x00000000, 0x02080000, 0x02000201, 0x00080001,
0x02080200, 0x02000001, 0x02000000, 0x00000201,
0x02000001, 0x00080201, 0x00080000, 0x02000000,
0x02080001, 0x00080200, 0x00000200, 0x00000001,
0x00080200, 0x02000201, 0x02080000, 0x00000200,
0x00000201, 0x00000000, 0x00080001, 0x02080200,
0x02000200, 0x02080001, 0x02080201, 0x00080000,
0x02080001, 0x00000201, 0x00080000, 0x02000001,
0x00080200, 0x02000200, 0x00000001, 0x02080000,
0x02000201, 0x00000000, 0x00000200, 0x00080001,
0x00000000, 0x02080001, 0x02080200, 0x00000200,
0x02000000, 0x02080201, 0x00080201, 0x00080000,
0x02080201, 0x00000001, 0x02000200, 0x00080201,
0x00080001, 0x00080200, 0x02080000, 0x02000201,
0x00000201, 0x02000000, 0x02000001, 0x02080200,
};

static final int SP4[]={
0x01000000, 0x00002000, 0x00000080, 0x01002084,
0x01002004, 0x01000080, 0x00002084, 0x01002000,
0x00002000, 0x00000004, 0x01000004, 0x00002080,
0x01000084, 0x01002004, 0x01002080, 0x00000000,
0x00002080, 0x01000000, 0x00002004, 0x00000084,
0x01000080, 0x00002084, 0x00000000, 0x01000004,
0x00000004, 0x01000084, 0x01002084, 0x00002004,
0x01002000, 0x00000080, 0x00000084, 0x01002080,
0x01002080, 0x01000084, 0x00002004, 0x01002000,
0x00002000, 0x00000004, 0x01000004, 0x01000080,
0x01000000, 0x00002080, 0x01002084, 0x00000000,
0x00002084, 0x01000000, 0x00000080, 0x00002004,
0x01000084, 0x00000080, 0x00000000, 0x01002084,
0x01002004, 0x01002080, 0x00000084, 0x00002000,
0x00002080, 0x01002004, 0x01000080, 0x00000084,
0x00000004, 0x00002084, 0x01002000, 0x01000004,
};

static final int SP5[]={
0x10000008, 0x00040008, 0x00000000, 0x10040400,
0x00040008, 0x00000400, 0x10000408, 0x00040000,
0x00000408, 0x10040408, 0x00040400, 0x10000000,
0x10000400, 0x10000008, 0x10040000, 0x00040408,
0x00040000, 0x10000408, 0x10040008, 0x00000000,
0x00000400, 0x00000008, 0x10040400, 0x10040008,
0x10040408, 0x10040000, 0x10000000, 0x00000408,
0x00000008, 0x00040400, 0x00040408, 0x10000400,
0x00000408, 0x10000000, 0x10000400, 0x00040408,
0x10040400, 0x00040008, 0x00000000, 0x10000400,
0x10000000, 0x00000400, 0x10040008, 0x00040000,
0x00040008, 0x10040408, 0x00040400, 0x00000008,
0x10040408, 0x00040400, 0x00040000, 0x10000408,
0x10000008, 0x10040000, 0x00040408, 0x00000000,
0x00000400, 0x10000008, 0x10000408, 0x10040400,
0x10040000, 0x00000408, 0x00000008, 0x10040008,
};

static final int SP6[]={
0x00000800, 0x00000040, 0x00200040, 0x80200000,
0x80200840, 0x80000800, 0x00000840, 0x00000000,
0x00200000, 0x80200040, 0x80000040, 0x00200800,
0x80000000, 0x00200840, 0x00200800, 0x80000040,
0x80200040, 0x00000800, 0x80000800, 0x80200840,
0x00000000, 0x00200040, 0x80200000, 0x00000840,
0x80200800, 0x80000840, 0x00200840, 0x80000000,
0x80000840, 0x80200800, 0x00000040, 0x00200000,
0x80000840, 0x00200800, 0x80200800, 0x80000040,
0x00000800, 0x00000040, 0x00200000, 0x80200800,
0x80200040, 0x80000840, 0x00000840, 0x00000000,
0x00000040, 0x80200000, 0x80000000, 0x00200040,
0x00000000, 0x80200040, 0x00200040, 0x00000840,
0x80000040, 0x00000800, 0x80200840, 0x00200000,
0x00200840, 0x80000000, 0x80000800, 0x80200840,
0x80200000, 0x00200840, 0x00200800, 0x80000800,
};

static final int SP7[]={
0x04100010, 0x04104000, 0x00004010, 0x00000000,
0x04004000, 0x00100010, 0x04100000, 0x04104010,
0x00000010, 0x04000000, 0x00104000, 0x00004010,
0x00104010, 0x04004010, 0x04000010, 0x04100000,
0x00004000, 0x00104010, 0x00100010, 0x04004000,
0x04104010, 0x04000010, 0x00000000, 0x00104000,
0x04000000, 0x00100000, 0x04004010, 0x04100010,
0x00100000, 0x00004000, 0x04104000, 0x00000010,
0x00100000, 0x00004000, 0x04000010, 0x04104010,
0x00004010, 0x04000000, 0x00000000, 0x00104000,
0x04100010, 0x04004010, 0x04004000, 0x00100010,
0x04104000, 0x00000010, 0x00100010, 0x04004000,
0x04104010, 0x00100000, 0x04100000, 0x04000010,
0x00104000, 0x00004010, 0x04004010, 0x04100000,
0x00000010, 0x04104000, 0x00104010, 0x00000000,
0x04000000, 0x04100010, 0x00004000, 0x00104010,
};

public static final boolean ENCRYPTION = true;
public static final boolean DECRYPTION = false;

public Des() 
{
}


private byte[] ecb(int[] ks, byte[] input, boolean mode)

// ks   : key schedule = array of 32 keys of 32-bit size
// input: array of 8 bytes for a 64-bit block to be cyphered
// mode : true = encryption, false = decryption

{

	int left, right; // left and right part of the block
	int t,u;
	int[] tmp = new int[2];
	byte[] output = new byte[8];

// We first structure the input in the proper way for future processing

		left =  (   (int) input[0] & 0xff ) |
				( ( (int) input[1] & 0xff ) <<  8) |
				( ( (int) input[2] & 0xff ) << 16 )|
				( ( (int) input[3] & 0xff ) << 24 );                           

		right = (   (int) input[4] & 0xff ) |
				( ( (int) input[5] & 0xff ) <<  8) |
				( ( (int) input[6] & 0xff ) << 16 )|
				( ( (int) input[7] & 0xff ) << 24 );
				
// We perform the initial permutation
		tmp = iperm(left,right);
		left = tmp[0];
		right = tmp[1];

// If ENCRYPTION (mode = true)
		if (mode)
				{
				for (int i=0; i<32; i+=4)
			{
						t = ( (right << 1) | (right >>> 31) ) & 0xffffffff;
						u = t ^ ks[i  ];
						t = t ^ ks[i+1];
						t = ( (t >>> 4) | (t << 28) ) & 0xffffffff;
						left ^= SP1[ t         & 0x3f]|
								SP3[(t >>>  8) & 0x3f]|
								SP5[(t >>> 16) & 0x3f]|
								SP7[(t >>> 24) & 0x3f]|
								SP0[ u         & 0x3f]|
								SP2[(u >>> 8)  & 0x3f]|
								SP4[(u >>> 16) & 0x3f]|
								SP6[(u >>> 24) & 0x3f];

						t = ( (left << 1) | (left >>> 31) ) & 0xffffffff;
						u = t ^ ks[i+2];
						t = t ^ ks[i+3];
						t = ( (t >>> 4) | (t << 28) ) & 0xffffffff;
						right ^= SP1[ t         & 0x3f]|
								 SP3[(t >>>  8) & 0x3f]|
								 SP5[(t >>> 16) & 0x3f]|
								 SP7[(t >>> 24) & 0x3f]|
								 SP0[ u         & 0x3f]|
								 SP2[(u >>>  8) & 0x3f]|
								 SP4[(u >>> 16) & 0x3f]|
								 SP6[(u >>> 24) & 0x3f];
						} // end of for loop
				} // end of if statement

	   else
// else DECRYPTION (mode = false)
				{
				for (int i=30; i>0; i-=4)
			{
						t = ( (right << 1) | (right >>> 31) ) & 0xffffffff;
						u = t^ks[i  ];
						t = t ^ks[i+1];
						t = ( (t >>> 4) | (t << 28) ) & 0xffffffff;
						left ^= SP1[ t         & 0x3f]|
								SP3[(t >>>  8) & 0x3f]|
								SP5[(t >>> 16) & 0x3f]|
								SP7[(t >>> 24) & 0x3f]|
								SP0[ u         & 0x3f]|
								SP2[(u >>>  8) & 0x3f]|
								SP4[(u >>> 16) & 0x3f]|
								SP6[(u >>> 24) & 0x3f];

						t = ( (left << 1) | (left >>> 31) ) & 0xffffffff;
						u = t ^ ks[i-2];
						t = t ^ ks[i-1];
						t = ( (t >>> 4) | (t << 28) ) & 0xffffffff;
						right ^= SP1[ t         & 0x3f]|
								 SP3[(t >>>  8) & 0x3f]|
								 SP5[(t >>> 16) & 0x3f]|
								 SP7[(t >>> 24) & 0x3f]|
								 SP0[ u         & 0x3f]|
								 SP2[(u >>>  8) & 0x3f]|
								 SP4[(u >>> 16) & 0x3f]|
								 SP6[(u >>> 24) & 0x3f];
						} // end of for loop
				} // end of else statement

// We perform the final permutation
		tmp   = fperm(left,right);
		left  = tmp[0];
		right = tmp[1];
				

// We put together both left and right part
		output[0] = (byte) (left &0xff);
		output[1] = (byte) (left >>> 8);
		output[2] = (byte) (left >>> 16);
		output[3] = (byte) (left >>> 24);
		output[4] = (byte) (right & 0xff);
		output[5] = (byte) (right >> 8);
		output[6] = (byte) (right >> 16);
		output[7] = (byte) (right >> 24);


return output;

} // end of method ecb

private int[] fperm(int left, int right)
// left  : left part of the block to be cyphered
// right : right part of the block to be cyphered
// the function returns an array of two integers corresponding to the permuted input
{
int t;
int[] out = new int[2];

		t =( (right >>> 1) ^ left) & 0x55555555;
		right ^= (t << 1);
		left ^= t;
		t = ( (left >>> 8) ^ right) & 0x00ff00ff;
		left ^= (t<< 8);
		right ^= t;
		t = ( (right >>> 2) ^ left) & 0x33333333;
		right ^= (t << 2);
		left ^= t;
		t = ((left >> 16) ^ right) & 0x0000ffff;
		left ^= (t << 16);
		right ^= t;
		t = ( (right >>> 4) ^ left) & 0x0f0f0f0f;
		right ^= (t << 4);
		left^=t;
		left &= 0xffffffff;
		right &= 0xffffffff;

		out[0] = left;
		out[1] = right;

		return out;
}


private int[] iperm(int left, int right)
// left  : left part of the block to be cyphered
// right : right part of the block to be cyphered
// the function returns an array of two integers corresponding to the permuted input
{
int t;
int[] out = new int[2];

		t = ( (right >>> 4) ^ left ) & 0x0f0f0f0f;
		right ^= (t << 4);
		left ^= t;
		t = ( (left >>> 16) ^ right ) & 0x0000ffff;
		left ^= (t << 16);
		right ^= t;
		t = ( (right >>> 2) ^ left ) & 0x33333333;
		right ^= (t << 2);
		left ^= t;
		t = ( (left >>> 8) ^ right ) & 0x00ff00ff;
		left ^= (t << 8);
		right ^= t;
		t= ( (right >>> 1) ^ left ) & 0x55555555;
		right ^= (t << 1);
		left ^= t;
		t = left;
		left = right & 0xffffffff;
		right = t & 0xffffffff;

		out[0] = left;
		out[1] = right;

		return out;
}

public static void main(String args[])
{
	byte src[] = {-100, -111, 56, -103, -122, 42, 36, -9, -115, 99, 64, -78, 53, 114, 18, 19};
	String key = "ZHONGMC";

	byte ks[] = new byte[20];
	
	System.arraycopy(key.getBytes(), 0, ks, 0, key.length());
	
	Des des = new Des();
	byte dst[] = des.processByteArray(ks, src, false);
	System.out.println( dst );
}


public byte[] encrypt(String key, byte[] src )
{
    return encrypt(key.getBytes(), src);
}


public byte[] encrypt(byte[] key, byte[] src )
{
	byte[] keyBuf = new byte[8];

	int keyLen = key.length; //();
	if( keyLen > 8 )
		keyLen = 8;
		
	System.arraycopy(key, 0, keyBuf, 0, keyLen);

	int length = src.length;
	
	byte[] srcBuf;
	
	if( (length % 8) > 0  )
	{
		int len = length;
		length = 8*(length/8 ) + 8;
		srcBuf = new byte[length];
		System.arraycopy(src, 0, srcBuf, 0, len );
		for( int i=len; i<length; i++)
			srcBuf[i] = (byte)0x20;
	}
	else
		srcBuf = src;
		
	return processByteArray( keyBuf, srcBuf, ENCRYPTION );
			
	
}
public byte[] decrypt(String key, byte[] src )
{
    return decrypt(key.getBytes(), src);
}


	public byte[] decrypt(byte[] key, byte[] src) {
		byte[] keyBuf = new byte[8];

		int keyLen = key.length; // ();
		if (keyLen > 8)
			keyLen = 8;

		System.arraycopy(key, 0, keyBuf, 0, keyLen);

		byte[] decBuf = processByteArray(keyBuf, src, Des.DECRYPTION);

		int length = decBuf.length;

		int len = length;
		int count = 0;
		while (decBuf[len - 1] == 0x20) {
			count++;
			len--;
			if (len == 0)
				break;
		}

		if (count > 0) // trim the padding ' '
		{
			byte[] tmp = new byte[length - count];
			System.arraycopy(decBuf, 0, tmp, 0, length - count);
			return tmp;
		} else
			return decBuf;

	}

private byte[] processByteArray(byte[] key, byte[] input, boolean mode)
{
	int[] ks = new int[32];
	
	byte[] in_block = new byte[8];
	byte[] out_block = new byte[8];
	byte[] output = new byte[input.length];

	ks = set_key(key);

	for(int i=0, j= input.length / 8; i<j; i++)
	{
		System.arraycopy(input, 8*i, in_block, 0, 8);
		out_block = ecb(ks, in_block, mode);
		System.arraycopy(out_block, 0, output, 8*i, 8);
	}
	return output;
}


private int[] set_key(byte[] key)
{
		int ks[] =  new int[32];
		int c, d, s, t;
		

		c =     (   (int) key[0] & 0xff )         |
				( ( (int) key[1] & 0xff ) << 8)   |
				( ( (int) key[2] & 0xff ) << 16 ) |
				( ( (int) key[3] & 0xff ) << 24 );
			
		d =     (   (int) key[4] & 0xff )         |
				( ( (int) key[5] & 0xff ) <<  8)  |
				( ( (int) key[6] & 0xff ) << 16 ) |
				( ( (int) key[7] & 0xff ) << 24 );           

		t  = ( ( d >> 4 ) ^ c ) & 0x0f0f0f0f;
		d ^= ( t << 4 );
		c ^= t;

//C do c first 
		t =  (  (c << 18)  ^ c ) & 0xcccc0000;
		c = c ^ t ^ (t >>> 18);
		t = ( (c << 17) ^ c ) & 0xaaaa0000;
		c = c ^ t ^ (t >>> 17);
		t = ( (c << 8) ^ c ) & 0x00ff0000;
		c = c ^ t ^ (t >>> 8 );
		t = ((c << 17) ^ c) & 0xaaaa0000;
		c = c ^ t ^ (t >>> 17);

//C now do d
		t = ((d << 24) ^ d) & 0xff000000;
		d = d ^ t ^ (t >>> 24);
		t = ( (d << 8) ^ d) & 0x00ff0000;
		d = d ^ t ^ (t >>> 8);
		t = ( (d << 14) ^ d) & 0x33330000;
		d = d ^ t ^ (t >>> 14);
		d = ( (d & 0x00aa00aa) << 7) | ( (d &0x55005500) >>> 7) | (d & 0xaa55aa55);
		d = (d >>> 8) | ( (c & 0xf0000000) >>> 4);
		c &= 0x0fffffff;


	 for (int i=0; i<16; i++)
		   {
				if (shifts2[i])
						{
						c=( c >>> 2) | ( c << 26);
						d=( d >>> 2) | ( d << 26);
						}
				else
						{
						c = ( c >>> 1) | ( c << 27);
						d = ( d >>> 1) | ( d << 27);
						}

				c &= 0x0fffffff;
				d &= 0x0fffffff;

				s = skb0[     c         & 0x3f                            ]                                          |
					skb1[( ( (c >>> 6 ) & 0x03 ) | ( (c >>> 7 ) & 0x3c) ) ] |
					skb2[( ( (c >>> 13) & 0x0f ) | ( (c >>> 14) & 0x30) ) ] |
					skb3[( ( (c >>> 20) & 0x01 ) | ( (c >>> 21) & 0x06) |
						   ( (c >>> 22) & 0x38 ) ) ];

				t = skb4[(    d         & 0x3f )                          ] |
					skb5[( ( (d >>> 7 ) &0x03  ) | ( (d >>> 8 ) & 0x3c) ) ] |
					skb6[( (  d >>> 15) & 0x3f )                          ] |
					skb7[( ( (d >>> 21) & 0x0f ) | ( (d >>> 22) & 0x30) ) ];

				ks[2*i] = ( ( t << 16 ) | ( s & 0x0000ffff ) ) & 0xffffffff;
				s =       ( s >>> 16 ) | ( t & 0xffff0000);
				ks[2*i+1]= ( ( s << 4 ) | ( s >>> 28 ) ) & 0xffffffff;

				} // end of for loop

				return ks;
}


/** This static method is used to get messages with a length compatible with a byte representation <=> length % 8 = 0.
  *	To do so, we add some blank characters (up to 7) at the end of the string.
  *	If we really want to get the exact string, we would have to store the length somewhere.
  * @param	String in the input String
  * @return	the padded String. At most, the length is increased by 7.
  */
protected static String strPadding(String in)
{
	int t = in.length() % 8;
	if (t==0) return in;
	else
	{
		StringBuffer buf = new StringBuffer(in);
		for(int i=0; i<((8-t)%8); i++) buf.append(" ");
		return buf.toString();
	}
}


} 
